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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Accounts receivable, allowance for doubtful accounts | $ 272 | $ 1,474
Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Preferred stock, shares authorized (in shares) | 2,000,000 | 2,000,000
Preferred stock, shares issued (in shares) | 0 | 0
Preferred stock, shares outstanding (in shares) | 0 | 0
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common stock, shares authorized (in shares) | 30,000,000 | 30,000,000
Common stock, shares issued (in shares) | 11,677,025 | 11,551,232
Common stock, shares outstanding (in shares) | 11,669,383 | 11,543,590
Treasury stock, shares (in shares) | 7,642 | 7,642
Series B Preferred Stock [Member] |  |
Preferred stock of subsidiary, par value (in dollars per share) | $ 1 | $ 1
Preferred stock of subsidiary, shares authorized (in shares) | 1,467,396 | 1,467,396
Preferred stock of subsidiary, shares issued (in shares) | 1,284,730 | 1,284,730
Preferred stock of subsidiary, shares outstanding (in shares) | 1,284,730 | 1,284,730
Preferred stock of subsidiary, liquidation value (in dollars per share) | $ 1 | $ 1
Preferred stock of subsidiary, accrued and unpaid dividends | $ 931 | $ 867

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